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TWIST DRILL FAILURES AND THEIR CAUSES Drill breakage : 1 . Caused by â€” lack of lip clearance . â€” Speed too slow . â€” Dull drill . â€” Back lash in work or machine . â€” Flutes clogged ( usually found in brass and wood ) . Broken Tang : 2 . Caused by â€” Imperfect fit of taper shank , May be caused by nicks , dirt , burrs or worn - out socket . Chipping of lip or cutting edge : 3 . Caused by â€” Too much pressure . â€” Too much lip clearance . Oversize hole : 4 . Caused by â€” Unequal angle of point . â€” Unequal length of cutting edge . â€” Loose spindle . Rough hole : 5 . Caused by â€” Dull drill . Improper grind on drill . â€” â€” Wrong or lack of lubricant . â€” Too much pressure . A FEW " DON'TS " FOR OPERATOR Don't change belt with motor running . 1 . Don't try to hold work â€” get a clamp or vise . 2 . Don't force the work â€” you will dull or break the drill . 3 . Don't try to stop revolving work â€” a broken drill 4 . is cheaper than a broken finger . Don't take chances â€” if you are not sure , ask your superior . 5 . CUTTING OILS All materials can be drilled dry if care is taken not to force the drill . If a drill starts to smoke when " dry " drilling , it should not be forced further but eased until excess smoking stops . When drilling with lubricant , the smoke arising from the chip is that of the oil and doesn't indicate injury to the drill . The following cutting oils are suitable under most conditions : 1 . Hard Steel â€” Turpentine , Kerosene , Soluble oil . 2 . Soft Steel â€” Lard oil , Soluble oil . 3 . Malleable Iron â€” Soluble oil . 4 . Cast Iron â€” Dry â€” or air jet . 5 . Brass â€” Dry . 6 . Aluminum â€” Kerosene or Soluble oil . 3
FEED AND SPEED FOR DRILLS OF HI - SPEED STEEL The following table covers speeds for most materials and in sizes within the capacity of the machine . The ratings are based on the use of " hi - speed " drills . For carbon drills use speeds about one - half those listed . Abnormal Conditions : Operation Under No particular precaution need be taken other than cleanliness in the case of dirt or mud . In case of extreme low temperature , sudden shock loads should be avoided and the machine should be run slowly several minutes before applying a load or running at high speeds . 4
LUBRICATION throughout All bearings are sealed and require no lubrication their life . The following lubrication is suggested : Oil feed pinion bearings daily with SAE 30 oil , through small 1 . holes on top of hubs , as shown on lubrication chart . 2 . Once a week , or oftener if service conditions are severe , rack feed sleeve to its maximum down position , clean thoroughly and wipe with light grease . 3 . At intervals of one or two weeks , the upper spindle should be oiled through the Empress oiler on top of cover 10206 .
REPAIR Aside from lubrication , as shown on lubrication chart , it may become necessary or desirable to dismantle the head for cleaning , inspection or repair . To remove spindle assembly . ( a . ) 1 . Place a wrench securely on collar 11787 to prevent spring from flying out and back off 5 / 16 setscrew . Unwind spring slowly and when free , feed pinion assembly can be withdrawn . 2 . Remove collar 10251 and spindle assembly can be with - drawn . ( b . ) To remove spindle from feed sleeve . 1 . Back out setscrew in collar 10210 and tap splined end of spindle against wooden bench or soft metal block , holding the feed sleeve with the hands . To remove spindle pulley assembly . ( c . ) 1 . Remove cover 10206 and guard 10225 . 2 . Exert equal pressure on at least two places on lower edge of pulley pushing it up to clear top bearing from its seat . This can also be done by exerting pressure against lower end of sleeve 10208 - P1 . Do not use hard metal when driving against sleeve â€” use wooden or brass bar as end of sleeve can become slightly upset and destroy the fit of the external and internal splines . When top bearing has cleared its seat , it can be re - moved from sleeve , as can lower bearing ; with both bearings removed , the sleeve can be pushed through the pulley . ( d . ) To replace spindle pulley assembly . 1 . Seat bearing in lower bearing seat ( in frame proper ) . 2 . Place pulley in position and push sleeve through â€” enter - ing it into lower bearing . 3 . Replace key and upper bearing . 4 . Replace cover and guard . ( e . ) To reassemble spindle and sleeve . Place bearing 55505 in seat and push spindle through . Place bearing No . 88505 in seat and assembly collar 10210 inside of bearing . Tighten setscrew . Be careful not to get end ad - justment too tight . A small amount of end play is more desir - able than a tight fit . ( f . ) To reassemble feed pinion assembly . 1 . Place spindle assembly in position and insert feed pinion , when spindle is at maximum up position . 2 . Make sure return spring is attached bcth to Retainer 11730 - 1 and collar 11787 . 3 . Wind spring 11965 with wrench on collar 11787 and tighten setscrew . Tighten spring so that spindle returns gently . 6
PRINTED IN THE U . S . A . FORM 8444E 3 - 57 WJK 2M